<div id="tracing-warning-header">
    <p>
        <strong>&#x1F6C8; Note</strong>: This is <em>pre-release</em> documentation
        for the upcoming <code>tracing</code> 0.2.0 ecosystem.
    </p>
    <p>
        For the release documentation, please see <a href="https://docs.rs">docs.rs</a>, instead.
    </p>
</div>